Ahmad had 8 tins of cookies. Each run contained the same number of cookies at first. He took 15 cookies from each tin. After that, the total number of cookies left in the 8 tins was equal to the total number of cookies in 2 of the tins at first. How many cookies are there in each tin at first?

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A: Earning

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A: Explained below

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Q: Tyler has 3 times as many books as Mai. How many books does mai have if Tyler has 21 books

A: